/**
 * @author alteredq / http://alteredqualia.com/
 * @author mr.doob / http://mrdoob.com/
 */

module.exports = function() {
  return {
  	canvas : !! window.CanvasRenderingContext2D,
  	webgl : ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( 'canvas' ).getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(),
  	workers : !! window.Worker,
  	fileapi : window.File && window.FileReader && window.FileList && window.Blob,

  	getWebGLErrorMessage : function () {

  		var domElement = document.createElement( 'div' );

  		domElement.style.fontFamily = 'monospace';
  		domElement.style.fontSize = '13px';
  		domElement.style.textAlign = 'center';
  		domElement.style.background = '#eee';
  		domElement.style.color = '#000';
  		domElement.style.padding = '1em';
  		domElement.style.width = '475px';
  		domElement.style.margin = '5em auto 0';

  		if ( ! this.webgl ) {

  			domElement.innerHTML = window.WebGLRenderingContext ? [
  				'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation">WebGL</a>.<br />',
  				'Find out how to get it <a href="http://get.webgl.org/">here</a>.'
  			].join( '\n' ) : [
  				'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation">WebGL</a>.<br/>',
  				'Find out how to get it <a href="http://get.webgl.org/">here</a>.'
  			].join( '\n' );

  		}

  		return domElement;

  	},

  	addGetWebGLMessage : function ( parameters ) {

  		var parent, id, domElement;

  		parameters = parameters || {};

  		parent = parameters.parent !== undefined ? parameters.parent : document.body;
  		id = parameters.id !== undefined ? parameters.id : 'oldie';

  		domElement = Detector.getWebGLErrorMessage();
  		domElement.id = id;

  		parent.appendChild( domElement );

  	}

  };
}
